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i <br /> 1117 Lone Palm Avenue Suite B <br /> y , _ Modesto California 95351 <br /> �p wwwatc-enviro com <br /> 209 579 2221 <br /> f t r 1 r Fax 209 579 2225 <br /> f A S S p C I A T E S I N C <br /> October 17, 2000 <br /> 54 92054 0006 <br /> Mr Jeff Wong <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Ave , Third Floor <br /> Stockton, CA 95202 <br /> Subject Third Quarter 2000 Groundwater Monitoring for C&R International Sales, 2403 <br /> W Navy Drive, Stockton, California <br /> Dear Mr Wong <br /> This letter report summarizes work completed at the above referenced site by ATC Associates <br /> Inc (ATC) during the Third Quarter of 2000 This work was on performed on behalf of C&R <br /> International Sales The site location is shown on Figure 1 <br /> BACKGROUND <br /> The site was the location of one underground storage tank In response to a San Joaquin County <br /> Public Health Services, Environmental Health Division (PHS/EHD) request for a subsurface <br /> investigation, RESNA Industries, Inc (RESNA) was engaged by the law firm of McDermott, <br /> Will & Emery to assess the nature and extent of soil and groundwater contamination at the site <br /> In early 1992, a RESNA field geologist observed the drilling of three soil borings (MW1, MW2, <br /> and MW3) at the site to characterize subsurface conditions Groundwater was encountered at a <br /> depth of approximately 15-16 feet below ground surface (bgs) The borings were advanced to a <br /> depth of approximately 30 feet below grade and subsequently converted to groundwater <br /> monitoring wells <br /> Laboratory analysis of soil samples collected from the three borings determined that petroleum <br /> hydrocarbon constituents were detected in the soil within 4-5 feet of the static water levels at the <br /> site Laboratory analysis of groundwater samples collected from the wells subsequent to <br /> development indicated that gasoline constituents were present above laboratory method detection <br /> limits in the groundwater samples collected from each site monitoring well Initial groundwater <br /> :•" monitoring data (March 1992) determined groundwater flow direction to the south A detailed <br />